Ch2 first app

1.
First Android App

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Create a AndroidProject

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File > Android ApplicationProject

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Android App Name

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Eclipse Project Name

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App Package NameGoogle play package is only

11.
Running Your FirstApp

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Introduction directories andﬁles in the Android project

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The ﬁrst Androidproject architecture http://developer.android.com/tools/projects/index.html

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AndroidManifest.xml <?xml version="1.0" encoding="utf-‐8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.firstapp" android:versionCode="1" android:versionName="1.0" > ! <uses-‐sdk android:minSdkVersion="8" android:targetSdkVersion="21" /> ! <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" android:label="@string/app_name" > <intent-‐filter> <action android:name="android.intent.action.MAIN" /> ! <category android:name="android.intent.category.LAUNCHER" /> </intent-‐filter> </activity> </application> ! </manifest>

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res/values/string.xml <?xml version="1.0" encoding="utf-‐8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.firstapp" android:versionCode="1" android:versionName="1.0" > ! <uses-‐sdk android:minSdkVersion="8" android:targetSdkVersion="21" /> ! <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" android:label="@string/app_name" > <intent-‐filter> <action android:name="android.intent.action.MAIN" /> ! <category android:name="android.intent.category.LAUNCHER" /> </intent-‐filter> </activity> </application> ! </manifest>

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res/values/string.xml <?xml version="1.0" encoding="utf-‐8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.firstapp" android:versionCode="1" android:versionName="1.0" > ! <uses-‐sdk android:minSdkVersion="8" android:targetSdkVersion="21" /> ! <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" android:label="@string/app_name" > <intent-‐filter> <action android:name="android.intent.action.MAIN" /> ! <category android:name="android.intent.category.LAUNCHER" /> </intent-‐filter> </activity> </application> ! </manifest> <?xml version="1.0" encoding="utf-‐8"?> <resources> ! <string name="app_name">FirstApp</string> <string name="hello_world">Hello world!</string> <string name="action_settings">Settings</string> ! </resources>

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res/values/string.xml <?xml version="1.0" encoding="utf-‐8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.firstapp" android:versionCode="1" android:versionName="1.0" > ! <uses-‐sdk android:minSdkVersion="8" android:targetSdkVersion="21" /> ! <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" android:label="@string/app_name" > <intent-‐filter> <action android:name="android.intent.action.MAIN" /> ! <category android:name="android.intent.category.LAUNCHER" /> </intent-‐filter> </activity> </application> ! </manifest> <?xml version="1.0" encoding="utf-‐8"?> <resources> ! <string name="app_name">FirstApp</string> <string name="hello_world">Hello world!</string> <string name="action_settings">Settings</string> ! </resources>

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src/{your package name}/ MainActivity.java public class MainActivity extends ActionBarActivity { ! @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } ! @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } ! @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } }

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src/{your package name}/ MainActivity.java public class MainActivity extends ActionBarActivity { ! @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } ! @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } ! @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } }

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res/layout/activity_main.xml public class MainActivity extends ActionBarActivity { ! @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } ! @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } ! @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } } <RelativeLayout xmlns:android="http://schemas.android.com/apk/ res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.example.firstapp.MainActivity" > ! <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/hello_world" /> ! </RelativeLayout>

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res gen srcbin jni libs assets layout layout-land = 橫向 layout-port = 直向 drawable xlarge = 960dp x 720dp large = 640dp x 480dp normal = 470dp x 320dp small = 426dp x 320dp menu Menu item value color.xml string.xml style.xml

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res gen srcbin jni libs assets BuildConﬁg.java /** Automatically generated file. DO NOT MODIFY */ package com.example.firstapp; ! public final class BuildConfig { public final static boolean DEBUG = true; }

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res gen srcbin jni libs assets R.java AUTO-‐GENERATED FILE. DO NOT MODIFY. package com.example.firstapp; ! public final class R { public static final class layout { public static final int activity_main=0x7f040000; } ………… }

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res gen srcbin jni libs assets package com.example.firstapp; ! import android.app.Activity; import android.os.Bundle; ! public class MainActivity extends Activity { ! @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } ! }

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res gen srcbin jni libs assets

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res gen srcbin jni libs assets Third party library

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res gen srcbin jni libs assets This is empty. You can use it to store raw asset files. Files that you save here are compiled into an .apk file as-is, and the original filename is preserved. You can navigate this directory in the same way as a typical file system using URIs and read files as a stream of bytes using the AssetManager. For example, this is a good location for textures and game data.

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res gen srcbin jni libs assets Android Project Builder

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Ch2 first app

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